Nano particle size violet tungsten oxide for thermal insulation paper can be prepared by the following process: The dried ammonium paratungstate (APT) is quantitatively fed into the industrial rotary tube furnace, which has passed NH3 by a screw conveyor. And APT is calcined under certain conditions. In this process, NH3 is decomposed to generate H2, which will make APT calcined in a mild reducing atmosphere, gradually decomposed, and reduced to obtain violet tungsten oxide.
According to the microstructure of the prepared violet tungsten oxide, the violet tungsten oxide agglomerate is composed of needle-like crystal polymerization, and the polymer is loose, and the obtained violet tungsten oxide is almost single phase W18O49. That is to say, the new process for preparing violet tungsten oxide powder by industrial rotary tube furnace is advanced and reasonable. The product quality is stable. And the microstructure is satisfactory. It means that industrial production is easy to realize.
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